Kids and young at heart adults building dams is the key.
But Llani is also correct by cleaning the rivers and allowing water to pass through quicker.

I had a mate who used to keep a section of the river Calder clear. Chain saw, land rover and trailer were his tools. When Yorkshire water started cost cutting he was on of the first to go.

The Calder has flooded more in the last 20years than the 50 before that.

Climate change my arse. Cost cutting by water authoritys for shareholders dividends and building for profit in inappropriate locations.